Substrate protection coatings are widely applied in the industry. Zn–Ni alloys have less potential for corrosion, thus preserving the steel substrate by corroding first. In this sense, this study used nickel-rich electroplating industry wastewater to produce Zn–Ni alloys under different conditions, analyzing the zinc sulfate concentration, electric current density, and rotating cathode in the deposition. The nickel removal kinetics showed a reversible and first-order behavior. The alloys with a composition of 2 wt.% nickel, according to energy-dispersive X-ray spectroscopy analysis, were more anti-corrosive with polarization resistance of 1276.7 Ω cm², than the alloys containing 5 wt.% nickel. Electrochemical impedance spectroscopy proved that alloys containing 2 wt.% nickel were more resistant to corrosion and indicated the formation of a porous oxide layer. Besides, the micrographs of the alloys containing 2 wt.% nickel showed homogeneity without cracks and nodular grains, unlike the alloys with 5 wt.% nickel, which had cracks and were heterogeneous. The X-ray diffraction diffractograms showed different structures according to the amount of Ni. Thus, the deposition of metals from wastewater is an alternative to conventional treatments and avoids the use of synthetic baths.

基材保护涂料在工业中得到广泛应用。Zn-Ni合金的腐蚀潜力较小，因此可以通过先腐蚀来保护钢基材。从这个意义上讲，本研究使用富镍电镀工业废水在不同条件下生产Zn-Ni合金，分析了硫酸锌的浓度，电流密度和沉积中的旋转阴极。镍去除动力学显示出可逆和一级行为。根据能量色散X射线光谱分析，镍含量为2％（重量）的合金更耐腐蚀，极化电阻为1276.7Ωcm ²，而不是含5 wt。％镍的合金。电化学阻抗谱证明，含2％（重量）镍的合金更耐腐蚀，并表明形成了多孔氧化物层。此外，与含5重量％镍的合金具有裂纹且异质的合金不同，含2重量％镍的合金的显微照片显示出均匀性而没有裂纹和球状晶粒。X射线衍射衍射图根据Ni的量显示出不同的结构。因此，废水中的金属沉积是常规处理的一种替代方法，并且避免了使用合成浴。